#define  _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
	int a = 3;
	int b = 5;
	//printf("a = %d b = %d \n", a, b);
	a = a ^ b;
	b = a ^ b;
	a = a ^ b;
	//printf("a = %d b = %d \n:", a, b);
	return 0;
}